... -quality alloy die steel 3,good surface treatment 4,stable function, high precision 5,competitive price Changzhou ... Tengcheng Machinery Manufacturing Co.,LTD . is a medium-sized enterprise which is specialized in ... of single-layer ,double-layer and multi-layer of plastic materials like PVC, PP,PS, OPP, PO, ... , discuss the cooperation. Extrusion mould in plastic machinery